﻿/*
 * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
 * Copyright (C) 2007, Shawn O. Pearce <spearce@spearce.org>
 * Copyright (C) 2008, Kevin Thompson <kevin.thompson@theautomaters.com>
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Git Development Community nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System.Collections.Generic;
using System.IO;

namespace GitSharp.Core
{
	/// <summary>
	/// Abstract TreeVisitor for visiting all files known by a Tree.
	/// </summary>
    public abstract class TreeVisitorWithCurrentDirectory : TreeVisitor
    {
        private readonly Stack<DirectoryInfo> stack;
        private DirectoryInfo currentDirectory;

        internal TreeVisitorWithCurrentDirectory(DirectoryInfo rootDirectory)
        {
            stack = new Stack<DirectoryInfo>(16);
            currentDirectory = rootDirectory;
        }

        internal DirectoryInfo GetCurrentDirectory()
        {
            return currentDirectory;
        }


        #region TreeVisitor Members

        public void StartVisitTree(Tree t)
        {
            stack.Push(currentDirectory);
            if (!t.IsRoot)
            {
                currentDirectory = new DirectoryInfo(Path.Combine(currentDirectory.FullName, t.Name));
            }
        }

        public virtual void EndVisitTree(Tree t)
        {
            currentDirectory = stack.Pop();
        }

        public abstract void VisitFile(FileTreeEntry f);

        public abstract void VisitSymlink(SymlinkTreeEntry s);

        public abstract void VisitGitlink(GitLinkTreeEntry e);

        #endregion
    }
}
